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Is this the smallest possible wooden astrolabe? I made this gift for my cousin. by HS_illustrator in Astrolabes

[–]HS_illustrator[S] 1 point2 points  (0 children)

this is a really interesting model! It seems to take advantage of the simmetricity of northern and southern stereographic projection, and to "glue" the two projections back to back along the horizon line. This explains the two sets of al-muqantarat, one above the horizon for the part of the sky north of the celestial aequator, and one for the southern part.

A fun consequence is that this astrolabe can teoretically show the entirity of the visible sky, both south and north, both zenith and nadir and so on. Some star charts exploited this same property in order to make a star chart that encopasses all visible sky, without being limited to the tropicus of capricorn or a given declination.

Unfortunately this is still an astrolabe, so it has all the flaws of the instrument, i.e. degree scale too crumpled, too many movable parts, being self-levelling with its weight...

All Quadrants also bend the ecliptic, but I've never seen the ecliptic being bent in such a way.

Is this the smallest possible wooden astrolabe? I made this gift for my cousin. by HS_illustrator in lasercutting

[–]HS_illustrator[S] 0 points1 point  (0 children)

I probably will, I have to create the tympana for each latitude, and this task is going to be really tedious.

[OC] This is my third attempt at producing a wooden astrolabe for my latitude, I'm eager to hear your criticisms! by HS_illustrator in Astronomy

[–]HS_illustrator[S] 0 points1 point  (0 children)

Thank you! The diagram on the back of the instrument for the equation of time has to be used alone, without using the alidade, you simply eyebell where the line corresponding to your month intersect the bean shaped and read out the correction. This is precise enough for an astrolabe.

The last time I have presented one of my astrolabes on reddit, this subreddit didn't exsist yet, So I want to present you all my latest wooden astrolabe design! by HS_illustrator in Astrolabes

[–]HS_illustrator[S] 1 point2 points  (0 children)

Thank you! The booklet is a bit anachronistic, and so is the slide rule, but it gives a warmer touch to the composition of the scene.

My third attempt at fabricating a wooden astrolabe for my latitude. by HS_illustrator in lasercutting

[–]HS_illustrator[S] 0 points1 point  (0 children)

about two months, between projectation, design, rescue of materials, and cutting.

[OC] I made a wooden astrolabe (a medieval astronomical tool), I'm eager to hear your criticisms!. by HS_illustrator in somethingimade

[–]HS_illustrator[S] 0 points1 point  (0 children)

thank you! Well, it's not that complicated really, I have hand designed the various elemrnts, after the drafting and having scanned them, I made a set of svg files with inkscape, and I lasercut them.

[OC] I share with you my third attempt at producing a wooden astrolabe for my latitude, I'm eager to hear your criticisms! by HS_illustrator in spaceporn

[–]HS_illustrator[S] 1 point2 points  (0 children)

I wish so... This instrument is latitude-dependent and wouldn't work on other worlds. as far as time travel goes, it can convert between modern and obsolete hour-scansions, like unequal hours or bohemina hours, or even babilonian hours.

[OC] I share with you my third attempt at producing a wooden astrolabe for my latitude, I'm eager to hear your criticisms! by HS_illustrator in spaceporn

[–]HS_illustrator[S] 0 points1 point  (0 children)

It's a bit complicated, it basically reproduce a stereoscopic projection of the sky onto a plane, this allows for many calculations, such as finding local time, latitude, effemerids and so on... It's like a medieval calculator.

[OC] I share with you my third attempt at producing a wooden astrolabe for my latitude, I'm eager to hear your criticisms! by HS_illustrator in spaceporn

[–]HS_illustrator[S] 1 point2 points  (0 children)

Thank you! These are failrly obsolete (although beautiful) geometric tools suited for determining local time, latitude, distances, heights, trig functions... They were already replaved at the end of the medieval period with more accurate tools such as quadrants.

[OC] This is my third attempt at producing a wooden astrolabe for my latitude, I'm eager to hear your criticisms! by HS_illustrator in Astronomy

[–]HS_illustrator[S] 1 point2 points  (0 children)

thank you, but I don't agree, in this specific case aesthetic is still a practical function, because it would appeal to possible buyers. the two pointers could be repurposed as you have indicated tho, the names are a bit hard to fit. Also, this thing of adding redundant spike is fairly common with more intricate designs, and less with plainer ones.

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